Update app.py

app.py

@@ -47,7 +47,7 @@ class AdvancedPdfChatbot:
         self.qa_chain = ConversationalRetrievalChain.from_llm(
             self.llm,
             retriever=self.db.as_retriever(),
-            memory=self.memory
+            memory=self.memory,
             combine_docs_chain_kwargs={"prompt": self.prompt}
         )